density

In the past two years, NASA’s Kepler Space Telescope has located nearly 3,000 exoplanet candidates ranging from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities range from that of styrofoam to iron.

Density, which is genetically linked, deals with the number of strands per square inch on your scalp. Normal density can range from slight to substantial, varying from person to person.